SureBlock™ Ultra-Narrowband Notch Filters
SureBlock™ Ultra-Narrowband Notch Filters

SureBlock™ Ultra Narrow-band Notch Filters

Coherent’s SureBlock Ultra Narrow-band Notch Filters are the ideal solution for highly selective wavelength applications like low frequency (low wavenumber) THz-Raman® spectroscopy.

With laser line attenuation of up to 99.9999% (optical density: OD4) and transition width of <10 cm-1, SureBlock filters can dramatically improve the ability of any Raman system to resolve low frequency Raman scattering. High transmittance on both sides of the notch enables both Stokes and anti-Stokes Raman spectra to be observed simultaneously.

Individual filters are mounted in 1” housings for compatibility with standard 1” optical systems. Alternatively, our SureBlock XLF Series THz-Raman Spectroscopy and Filter Systems integrate the notch filters into a rugged, pre-aligned, light-tight enclosures with optional laser sources, ASE filtering, and free space or fiber inputs and outputs.

Available at standard Raman wavelengths: 488, 514, 532, 633, 785, 808, 830, 976 and 1064 nm. Custom wavelengths are available on demand. We also recommend the use of our NoiseBlock™ ASE Filters and 90/10 Beamsplitter Filters to achieve optimum performance of the notch filters when using diode or diode-pumped laser sources SureBlock Notch filters are reflective volume holographic filters (VHGs), produced in a proprietary glass designed for long lifetime, high efficiency, and excellent transmission. Coherent’s fabrication process is highly stabilized to ensure excellent part-to-part repeatability.

Ultra Narrow-Band Notch Filters for Raman Spectroscopy

Specification Summary

Parameter 488 nm – 1064 nm
Spectral Transition Width (center to 50% transmission) <10 cm-1
Optical Density at Laser Line (each filter) >4
Free Space Aperture Diameter Standard: 9 mm in 1″ mount, Custom sizes available

SureBock™ Specifications



Raman Spectroscopy

Features & Benefits

  • Ultra-narrow rejection bandwidth
  • Highly repeatable performance
  • Environmentally stable at high temperature and humidity
  • No degradation over time, even under high-power illumination conditions

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